package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 查询营业额数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        while (begin.isBefore(end)) {
            dateList.add(begin);
            begin = begin.plusDays(1);
        }
        dateList.add(end);

        // 存放从begin到end范围内的每天的营业额数据
        List<Double> turnoverList = new ArrayList<>();

        // 查询date日期对应的营业额数据，营业额是指：订单状态为已完成，且在begin到end之间的营业额数据
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // 查询
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnoverList.add(turnover == null ? 0.0 : turnover);
        }

        String datetime = StringUtils.join(dateList, ",");
        String turnover = StringUtils.join(turnoverList, ",");
        return TurnoverReportVO
                .builder()
                .turnoverList(turnover)
                .dateList(datetime)
                .build();
    }

    /**
     * 查询用户数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        while (begin.isBefore(end)) {
            dateList.add(begin);
            begin = begin.plusDays(1);
        }
        dateList.add(end);

        // 存放从begin到end范围内的每天的用户数据
        List<Integer> newUserList = new ArrayList<>();
        // 存放从begin到end范围内的每天的总用户数
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);

            // 查询总用户数
            Integer totalUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);

            map.put("begin", beginTime);
            // 查询新增用户数
            Integer newUser = userMapper.countByMap(map);
            newUserList.add(newUser);


        }

        String timeList = StringUtils.join(dateList, ",");
        String newUserListStr = StringUtils.join(newUserList, ",");
        String totalUserListStr = StringUtils.join(totalUserList, ",");

        return UserReportVO
                .builder()
                .dateList(timeList)
                .newUserList(newUserListStr)
                .totalUserList(totalUserListStr)
                .build();

    }

    /**
     * 统计指定时间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        // 存放从begin到end范围内的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();
        while (begin.isBefore(end)) {
            dateList.add(begin);
            begin = begin.plusDays(1);
        }
        dateList.add(end);

        // 存放从begin到end范围内的每天对应的有效订单数和订单总数
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();

        // 遍历dateList集合，查询每天的有效订单和订单总数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // 查询每天的订单总数
            Integer orderCounts = getOrderCount(beginTime, endTime, null);
            orderCountList.add(orderCounts);

            // 查询每天的有效订单数
            Integer validCounts = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            validOrderCountList.add(validCounts);
        }

        // 计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        // 计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 统计指定时间区间内的销量排名top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        String nameList = StringUtils.join(salesTop10.stream().map(GoodsSalesDTO::getName).toArray(), ",");
        String numberList = StringUtils.join(salesTop10.stream().map(GoodsSalesDTO::getNumber).toArray(), ",");
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
               .build();
    }

    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业数据--查询最近三十的数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //2.通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            // 基于模块文件创建Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(in);
            // 获取Excel文件中的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            // 填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            // 获得第四行
            XSSFRow row3 = sheet.getRow(3);
            row3.getCell(2).setCellValue(businessData.getTurnover());
            row3.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row3.getCell(6).setCellValue(businessData.getNewUsers());

            // 获得第五行
            XSSFRow row4 = sheet.getRow(4);
            row4.getCell(2).setCellValue(businessData.getValidOrderCount());
            row4.getCell(4).setCellValue(businessData.getUnitPrice());

            // 填充明细数据
            for (int i = 0; i < 30 ; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天额营业数据
                BusinessDataVO businessData2 = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                XSSFRow row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData2.getTurnover());
                row.getCell(3).setCellValue(businessData2.getValidOrderCount());
                row.getCell(4).setCellValue(businessData2.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData2.getUnitPrice());
                row.getCell(6).setCellValue(businessData2.getNewUsers());
            }


            //3.通过输出流将Excel文件下载到客户端
            ServletOutputStream outputStream = response.getOutputStream();
            excel.write(outputStream);

            // 关闭资源
            excel.close();
            outputStream.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }

    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        return orderMapper.countByMap(new HashMap<String, Object>() {{
            put("begin", begin);
            put("end", end);
            put("status", status);
        }});
    }
}
